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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3172845a5d35117e56c78d012375610983b9a1ad2616c6f141f30919c808d7f' 
  AND token = 'JUNmocwCHqV/gyEzGn5K1LLw0EktDpWLY0SEX6A9EMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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