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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30253fd821b6c3ee144ca4429685d624402aa1808234eb6cf0a4cceb3bd1f415' 
  AND token = 'v3C8UolWtVpftRoPK1yJF8hWRJuo37rj+3FmlBRzzyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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