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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3458e595d9c5aea3d16760f575e8e2c8e799cda8f95af58967130c6f0c497471' 
  AND token = '66BleCLd4u1wZ80iFl9umfRzi8aFMw0ZdN+xBanC5sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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