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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03f8bf0607ad9a324aca682d6a19db40872f142ab893f5b710dbac90131154e' 
  AND token = 'R8cGuNb0xlXGv7wB+yjuV1aGL+1cYc6wDtKfXk6cnk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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