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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6511f95ffb4c4cad00f7bd2b75ab7f8ea546b8e44b54d157198ae43484dc880f' 
  AND token = '17a3MMz6K/mOc52AarLzOyy8DQRISZsFy1jkN5cOlmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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