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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8ba4f3dffdc9a86354a901057df5d50e5b2db791612cd6c3b89babbc0d3748' 
  AND token = 'LbihbR94+Pnl+tQRvt1CPZT6DvV9FuBu/fRjYiQjMdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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