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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded4482a9077d80427b79b222baba36733c2a798447bf1fbb740b59f44a317da' 
  AND token = '88ne8HotQnBO6420pSo4fX4A50ZlZOt9TqTNIvGt/Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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