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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec9979bfa1504c10887ec00c91dc745b205c73984428f677c9cec4d9aeef830' 
  AND token = 'keGt1+toTHgZmXxNAg8Bki5QDpUfH9+/JhrtNGT5jEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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