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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598d6159677891c17b3c97ee929bf0178da8a153f46c0aeecf89e2276b8fbea8' 
  AND token = 'HCY3TlI7cSThys/1hTxdOaq6nOdK5cJmB7nXy+G+nuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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