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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '454e10f79a49012c21cec537db55c2312e1f3962b8b05ed377064b44dc97acd6' 
  AND token = 'TU5cpwcp04taZjnRKXh7YHveqBxS+9eWPXQ8tGHDdY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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