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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b5297721b09978180e4f6a4ef424799171d75dd3446ff6c9fa87ac190eeedb' 
  AND token = 'vfzpqp6Ww09Wm9dYmyoYwbxLbbCxwY0+w1ktTlbI8s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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