SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb6a99124a1d6f89032d9eb4528aa044d9956b4985137bfdf2fd83f35747b03' 
  AND token = 'Ggj/PWlkMaR0bBVYgKmj1AQCmHRgG/bxy+6MPCsW1c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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