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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6b2343165a663f42661b4ffbd26ac8e9b27c8b7be9ba3ba12a35b9db3477e1' 
  AND token = '7HXYfPYwtL0D/pvlJriO/0btBgCj18yUvE/Qy6dIddA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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