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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2175d88f664c353372b8fed5ed49aa4488066f3da33680352f2b35080f5e4b72' 
  AND token = '/h0DeZHrIs80IkhKcv5jA19pP8UsO3v/hYUTjzvo5hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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