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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b39d2be492c1408c6de946093d9fa2ae37e339c676a79d33a0a0af06963a15' 
  AND token = 'J/34Z2J8UNO9xj93QzbI0ZteGESAWzzYZJhU2qimfN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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