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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d030b65213b6c800988e132ec388e2ea333a58a756051fbf25b055fc0333018' 
  AND token = 'XcrXcILSqrpDi0b1odthfKZiRn/ZqkyXzG+oynTifxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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