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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c4e864ac516272e3600f2369758a3c45b1ca69074fa710685943fd935c88a95' 
  AND token = 'fGj4Kdhwln2Dyn7VrZJ8QI5RtTvWPEc7X6jpwE8Erx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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