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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724d40f12a6891de6f75f2d30bb546c96c5074767d847863a0bd6f9978e65bd4' 
  AND token = 'c9qLQs1rPjEUGzwli70g0EgQJMkkxcTOV0sis7RX67M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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