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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bcdc7f7173296ef949b10be3012613075ab0a582bc37ec0ad4181fdbdc5b569' 
  AND token = 'qy8CYNCjmD5MgQMHonHM95fG3YPYxEces1Zi6XGY99I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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