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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb20db31d0d21e9d9643520e33f596917d2672fb855d14813f0bc67eda33a5e' 
  AND token = 'UDE63bngHEE70vOX5B0EkKIQQNFwus5CG5TM9h4Wlds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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