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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81479f5e9e487b3a9704561490bd08ade62cdc979d9d96f83ccb88385d0c3bf9' 
  AND token = '57SwqIzo0BdH/NpIHPZlj7vvP7zCdvQEE9TXrjhl1jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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