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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debd72e387c82d5ab7323b1e75962f4efffb3d36013c3dced058ca15276e0616' 
  AND token = '8i5gupB/lns8aF8XzcAlZLy6/5vd4O6Ht4U7SK+TFPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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