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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2f84462e14e2df3921f81929f0e6d1daa6810d6278afd391accb7dd959bee7' 
  AND token = 'TcZHPJB9O+76PQ5pStoIoCUgy2iKhKGHeNEboAe7mg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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