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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac557fd444478a334368065df98c1e1274f28614b5a56ac9c6a002c67e313bc0' 
  AND token = '/bRNXAQUzbV6gQ0qR2FN7VClN/Z6qIz6Bvhqll0vaqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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