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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e498f1436f7bcd26edb538a9db278d4b817a38d5e826f03b69d73b8c64ff56' 
  AND token = 'vnWLz5XeRU+ZaTGjno/TQtTixsXbiu+qWobI864jiCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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