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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263cc3053e1344dd80bc7ca5494f1e9af1b7d6434fab73910195b84683274012' 
  AND token = 'P0hP7tQ7IK7GjR3IJ2BPXd/5gPsKf5QWBQO4CXk3fU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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