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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ccd3bfe96963dc958e38a4ccec0dfb64437d4d05152929bf27902c328dc55b' 
  AND token = '4eX2dypo6fjjic04pJxJSX4oxvIc8Xm6d2MBLcZwfbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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