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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6f606556744fa7c346c5ef51b86ebe26df4cd20bf40184686f7c366ccd2114' 
  AND token = 's8KjP+zXtzVaKhfS4vgnhKUyU8xEg2WrzKYR4piHgWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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