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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f4d4141a78cb1896fefabe3248c8eb9ecba5ff22fe164dcb438bcfc63223a17' 
  AND token = 'bQVQBvid0kZe5p3LqtYjKP62Y44ZGYTUP7cLzKvZo6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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