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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a9a0367dae5cbceefd311c8529412b3d1df987fab85196b360cb8311e4a9ab' 
  AND token = 'Y+Uvc/HFeFnNtuVt/vdvBwcUCUYkx5jH6vEM9v74VqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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