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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99eb35bca6080a23467d27c736d6a5bb915dc307b79ddd97024a4c449bba8031' 
  AND token = 'Hj1oexCVoucflvj3Rangq8KjdDOYh7di4VwqrEbVf68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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