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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1be2d8da9ff0f51969eb666d6886350e4dd60492e14ced23b7303135954385' 
  AND token = 'g1vAEQTACqTsG5IbH8AbxUrRX6fXfjVQekOAQTTcSDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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