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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4807e991fc83748078f1b6df2ae87a0aba09c1e7e369b9799bbb6f9238496b' 
  AND token = '3GAsBuj2vvVXdu9IAdHewBxgE796Dlxr7xj4lQIRVUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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