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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb62a8d9667e8f0ae403a37071fd72fd3a932d84ab7c4cafded03ae0accd7b9' 
  AND token = '8NVwUjaJ9vciyKehyL6zaOEk8YBQ1jYNULeWLQVSG1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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