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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969734dc906a75832a5f93c4c4985402a3f8acf661a80782a1d46375b84cd52c' 
  AND token = 'JqMh8CfY19aq/pfnJdfG2I+FEgQQbZtImX4ORafi76g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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