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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6f1300926fa2b29a42581c6e04072383c7b4c35aed0a6e2718b788bc570877' 
  AND token = 'ufwiRluyPntwLDX6z5pqazBwad7E9KSA8vCtpWnZ6OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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