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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c85434d4cf320fa9b54df54132c551636a457d6d08b39ae441ebe9779be39c' 
  AND token = 'tq0Et6MN1obfYclcNr11I1Pex10Ze1VaAU53ypRovuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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