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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311047e74ab1fe5efd29b88ecff9d9c2a9cdd218c73f0e97ec151df251ba5a4a' 
  AND token = 'mktU0h765eVlpEz36yFeoBrZC3Kilt4KC7rfOW5j9Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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