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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf39d772a902c57c7ba3a31b95422412a328321b4f69fb3739e15d3bf5a8c6e' 
  AND token = 'pLAQJIV5RUmXTkRkQJb5o+0c7Joupc9Kf0303WSAqpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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