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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77b59b35c3bc1dc5a89e7adff5add11db7be4e43614ea40d1750eff0bd6f99e' 
  AND token = 'O74UlZLkqHWevWC2o4MvX41l0zUjuKSYXNfxGXe/Kz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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