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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdbbb8a635b827c9120f585d9594f61b2058c529d7a838d29c9f958b7821fe8' 
  AND token = 'en966aUHYoNguMiq/NezK+s7i53nNelyWrdGeLcPa/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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