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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a448cb00ff45e9d59eeacfe7b86d0a92a132842cbcf8119554cd84d1aa9a9136' 
  AND token = 'SQcpI6G3+DKG6UrxXS4S6E5xx0/itdbRbXqbMV007v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}