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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99416bbff9afe4e4f3199d9a877393c838f47f3f92e5ea00013ff30768e8b6e4' 
  AND token = '0L9Tupup4i0m0VtsVMzovv6hOMVftepzp8kEvXllcHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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