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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4fe70fc022271e09f85498869a44dea3c8f9eb25d4f801294b8356dfe31be1' 
  AND token = 'YRX7VsnE/ljiiimcAm7vagfZDRVTzU3RP5p2ebD6PzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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