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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566b688074a67a01f28e531548a039620ef60e3f9d37a5edcc58f2f03693fe5b' 
  AND token = 't/zVebmn6jr0irluQR8FGEO05Y2Nt+9FcKRSkJhUtM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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