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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d83ba3ddc378f11f9c14e2bdb2233d51ee4dfe890473fc52a8b2e3ab6b6df6' 
  AND token = 'mrmjvNmAxeYV9rtxQ7Y5/MP39aUeFtPcNMOVQGD1XPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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