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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd7f61c454ecdf9499369f3801bdd5389efc094de376fb2852554b5d888853d' 
  AND token = '9f0i3bBljDJ73AMQV2AiZMT0YRwrgQSWfE+RAITrbfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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