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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18c6b058051ed8cdf155ac1f0af7a03c542da4e21a711ab0d9f1b2f951466b9' 
  AND token = 'Y4lvYKkuLb0Yz4wj+QOq6oaOJ98WLoJ8IX2TEoGCjUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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