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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3fe371a5cd7143ad026e0ed2256105f794faef27dba403797c25c205bf95a2' 
  AND token = '4TLabFLWUBB1X/Tg36BhgkMpIsPk5pDwoPmHNPQmkqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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