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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d6c2c9f58c7135538802132dcddb7eb9a9783729055152f225f684e365718a1' 
  AND token = 'HedSUI6n2AYnlgqeboTkMuh67ylh3zx5y8tBfYmC/Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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