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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd322c5b73eb39c8c2eb21fc1de512a6639c41401666b52017fea294eddd25ada' 
  AND token = '7DJr7MVtnPkDfVU7aOUWcNuXzQbzbyCqE6AMf0cZAjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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