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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6484a9ad878f9fa77086032823cfe392e910a2555533b129133f741cb95bbc' 
  AND token = '6cYKNEChm80hWx+oFkHP4RiWXC56fSVv52UahVj5o3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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