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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9a710a80b0f430db1c3f5cc62be9c210ed9b722dc90437790460e55a70289c' 
  AND token = '2EAI4zT3CbI4zKJd6f6VwOoFW/GbDclsqAsDxtlpaTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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