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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d97613046bac3d1378a7aded60b36947b0ac11631653a70ee1a7b6173dab852' 
  AND token = 'uLQIxu0toBoxeAzJ53i/gY2Jcv0UK2jaHBqKr8BYGFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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