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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a12dce3912e687d0a5a59e272946a34e429ff2826e1a41992e13aeeaed955c2' 
  AND token = '6WE6SSbfH6ggdW5dWDO3HBj3/zn4qfm4JT5Inp9WzKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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