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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9a19e04b934293240aab4e94572ae1dfc8886948b97fe391d4c771c6f9361c' 
  AND token = 'MR/0OdWVjkWByZY9vFEyWatIGo8wzqwb316q4s3owkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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