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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d9cc99e8e802b9b578f3beaf3e12a87068ee3621c137cc14d50eb477624ef6' 
  AND token = 'nAygo2ak47WVKU98igxHUGWlZ098SnpUEUGQGr9qZrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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