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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11e484021b1ae0a2ccb34c44e12d5236c32b80ac897bb3f603c7995748e1940' 
  AND token = 'ONl5IllnpuIUYkjsgdIhomGHwXkR5LNnkIZXcoJgY+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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