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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414bbbc35cef0de70297132eb0a7a4c31e5153f38725c9dcb62914c3961f80ea' 
  AND token = '5ulwBJGnudAxXgLYJBSo3y3kiPWny5SdjFrm3R05KNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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