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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fdc958cfc2057fb79975050c7b37a6ad14c11604599e10a720d17fa3a5b527' 
  AND token = 'qm5vH7igAHgXixf6k9EhE6O9dIiDK0l8T/9hr+BGOKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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