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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb77eab8a42cffb6d099b483a846015d4856c4accd13fc8f5fcbd82e2eaea6d' 
  AND token = 'MBuBV9J27BKQJJa6W9OqS3bwGtPKIV13umPq61GmJuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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