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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30a0f7b5ed3b9b7d245c645a466d3b0adb3611e2bbf731754af06b3f2aa0fd3' 
  AND token = 'zlKb3QMFdarz0O0AHK8Qw7rIUVo5N/Tvdy8HYazF/GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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