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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f42f2a2386b2dcfe0f44da8e97df6707a624f9c2afefab1b90c43bc9ed11710' 
  AND token = 'yS5sh8xtmd7srs7WAvaei7eFvGiY9D6oHrb6JF+H9w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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