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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae060ea826bfa0c5ccf72ea20a6ff19fa6bcdc5b11368ea747b5a8a636f9b39e' 
  AND token = 'z77kybHOliHKiA9vWJulI+leaEgDNnoiR4wRwO+7Cz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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