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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f197d8fdf32a11376eb609e9fade9ef664c73d43e7de0577824675809027a14' 
  AND token = 'JboN5DkoUoIv1JlV8Dww13o2Kw7vBhsAQtStr2OF8fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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