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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b23b8d3465f0011b183ada560bcd83df0ddedbf67929c8d0bf24e91fea5c34' 
  AND token = '6ipzgLKxTNioDOfS0QN1dHwB1IZ53qTFxHYwgtK9OeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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