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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9a3cbe7cd266686245826d0bcc2e6a6d89c8b1d0568226bf9f0c8c8c23702d' 
  AND token = 'J6iAiyoDm4o7k2tAgGQpIu4nsNWYndBRQ1SGAF2Mj2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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