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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15677715c667001565dbabaf0be1dcdd7c556d764b8fa40325a8df5446029194' 
  AND token = 'wh3/CrIgz9bhaQ5moa8xLXwzk79F5AQ53WRILTfk5MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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