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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d425b51baf9355589f86b3acab597578d5bfcf624c9cc7e7810663dc1f228dc' 
  AND token = 'pTw9f7HN8Brt1L7ZqLI/B6fj1G0j9qO7dCF98kifg2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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