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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da4a739ee6488542a5b7dceb35dedcc3e76bd65de6a329de0220776695b3777' 
  AND token = '2rJFtg6EWwN53iQvWFCF/h5OAYcmX/p2YbXfuXN/Su4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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